<?php defined('BASEPATH') OR exit('No direct script access allowed');

class db_driver_mysqli {

    public $tablepre;
    public $version    = '';
    public $drivertype = 'mysqli';
    public $querynum   = 0;
    public $slaveid    = 0;
    public $curlink;
    public $link       = [];
    public $config     = [];
    public $sqldebug   = [];

    function db_mysql($config = []) {
        if(!empty($config)) {
            $this->set_config($config);
        }
    }

    function set_config($config) {
        $this->config = &$config;
        $this->tablepre = $config['1']['tablepre'];
    }

    function connect($serverid = 1) {
        if(empty($this->config) || empty($this->config[$serverid])) {
            $this->halt('config_db_not_found');
        }

        $this->link[$serverid] = $this->_dbconnect(
            $this->config[$serverid]['dbhost'],
            $this->config[$serverid]['dbuser'],
            $this->config[$serverid]['dbpw'],
            $this->config[$serverid]['dbcharset'],
            $this->config[$serverid]['dbname'],
            $this->config[$serverid]['pconnect']
        );
        $this->curlink = $this->link[$serverid];
    }

    function _dbconnect($dbhost, $dbuser, $dbpw, $dbcharset, $dbname, $pconnect, $halt = true) {

        $link = new mysqli();
        if(!$link->real_connect($dbhost, $dbuser, $dbpw, $dbname, null, null, MYSQLI_CLIENT_COMPRESS)) {
            $halt && $this->halt('notconnect', $this->errno());
        } else {
            $this->curlink = $link;
            if($this->version() > '4.1') {
                $link->set_charset($dbcharset ? $dbcharset : $this->config[1]['dbcharset']);
                $serverset = $this->version() > '5.0.1' ? 'sql_mode=\'\'' : '';
                $serverset && $link->query("SET $serverset");
            }
        }

        return $link;
    }

    function table_name($tablename) {
        $this->curlink = $this->link[1];

        return $this->tablepre . $tablename;
    }

    function select_db($dbname) {
        return $this->curlink->select_db($dbname);
    }

    function fetch_array($query, $result_type = MYSQLI_ASSOC) {
        if($result_type == 'MYSQL_ASSOC') $result_type = MYSQLI_ASSOC;

        return $query ? $query->fetch_array($result_type) : null;
    }

    function fetch_first($sql) {
        return $this->fetch_array($this->query($sql));
    }

    function result_first($sql) {
        return $this->result($this->query($sql), 0);
    }

    public function query($sql, $silent = false, $unbuffered = false) {
        if('UNBUFFERED' === $silent) {
            $silent = false;
            $unbuffered = true;
        } elseif('SILENT' === $silent) {
            $silent = true;
            $unbuffered = false;
        }
        $resultmode = $unbuffered ? MYSQLI_USE_RESULT : MYSQLI_STORE_RESULT;
        if(!($query = $this->curlink->query($sql, $resultmode))) {
            if(in_array($this->errno(), array(2006, 2013)) && substr($silent, 0, 5) != 'RETRY') {
                $this->connect();

                return $this->curlink->query($sql, 'RETRY' . $silent);
            }
            if(!$silent) {
                $this->halt($this->error(), $this->errno(), $sql);
            }
        }
        $this->querynum++;

        return $query;
    }

    function affected_rows() {
        return $this->curlink->affected_rows;
    }

    function error() {
        return (($this->curlink) ? $this->curlink->error : mysqli_error());
    }

    function errno() {
        return intval(($this->curlink) ? $this->curlink->errno : mysqli_errno());
    }

    function result($query, $row = 0) {
        if(!$query || $query->num_rows == 0) {
            return null;
        }
        $query->data_seek($row);
        $assocs = $query->fetch_row();

        return $assocs[0];
    }

    function num_rows($query) {
        $query = $query ? $query->num_rows : 0;

        return $query;
    }

    function num_fields($query) {
        return $query ? $query->field_count : null;
    }

    function free_result($query) {
        return $query ? $query->free() : false;
    }

    function insert_id() {
        return ($id = $this->curlink->insert_id) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);
    }

    function fetch_row($query) {
        $query = $query ? $query->fetch_row() : null;

        return $query;
    }

    function fetch_fields($query) {
        return $query ? $query->fetch_field() : null;
    }

    function version() {
        if(empty($this->version)) {
            $this->version = $this->curlink->server_info;
        }

        return $this->version;
    }

    function escape_string($str) {
        return $this->curlink->escape_string($str);
    }

    function close() {
        return $this->curlink->close();
    }

    function halt($message = '', $code = 0, $sql = '') {
        throw new DbException($message, $code, $sql);
    }
}
